This product is a serum-free NK cell culture medium with clearly defined ingredients and no animal-derived components, specifically optimized for the large-scale activation, expansion, and functional maintenance of natural killer cells. Its core formulation precisely mimics the in vivo immune synapse microenvironment by integrating high concentrations of key cytokines such as IL-2 and IL-15, along with specialized metabolic support components. This enables efficient promotion of autologous or allogeneic NK cell expansion while significantly enhancing granzyme expression and ADCC effects. It ensures sustained high cell viability, purity, and killing activity throughout extended culture cycles lasting several weeks.